JP2516138B2 - Grounding method and structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a grounding structure for burying a wire-like good conductor extending from various equipment under the ground and grounding the grounding resistance, and reducing the grounding resistance. The present invention relates to a simple and excellent grounding method and a grounding structure.

[0002]

2. Description of the Related Art Conventionally, grounding work has buried a grounding wire having a cross-sectional area capable of sufficiently flowing a grounding current in the soil, but the grounding wire has a circular cross section and has a small surface area relative to its weight, which is low. When ground resistance is required, the ground wire is generally long or the ground rod is deep. It is known that the ground resistance decreases as the contact area with the soil becomes larger and the contact with the soil becomes better, but it is difficult and wasteful to secure a large ground area unnecessarily. Therefore,
It is required to construct with as little material as possible, small area, and low construction cost. In this way, in order to obtain the ground resistance required in a limited area, a method of connecting a copper or aluminum plate (ground sheet) in addition to the ground wire and burying it together in the soil, or a relatively low resistance A method of placing or spraying a low grounding agent (concrete mortar mixed with carbon powder, carbon fiber, etc.) around the grounding wire is used.

However, in the former so-called grounding sheet construction method, cavities are likely to be formed in bad soil and the grounding sheet and the soil are less compatible with each other, so that the grounding sheet and the soil do not effectively contact each other and the entire area of the cut hole is reduced. I can't say I'm using it. It is also difficult to connect the ground wire and the contact sheet. Further, the above-mentioned grounding sheet has a wide width and is difficult to carry or handle at the construction site. On the other hand, in the latter method using the grounding reducing agent, the contact between the reducing agent and the soil is good, but the contact between the grounding wire and the reducing agent and the contact between the reducing agents cannot be said to be reliable, and the reducing agent Depending on the type, the resistance may deteriorate due to corrosion of the ground wire or elution of the reducing agent.

[0004]

The problem to be solved by the present invention is to provide a grounding method and grounding which are easy to handle during transportation and construction, have a low grounding resistance, and can be easily connected to a grounding wire. To provide the structure.

[0005]

Thus, according to the invention of "Claim 1" of the present application, "a grounding wire (2) extending from various devices is buried under the ground (G) to be grounded. Yes, it can be expanded like a net by pulling in the width direction
Ground intended to ground a flexible long plate-shaped good conductor (4)
(G) Depending on the size of the embedding cutting hole (6) formed below
Then, the plate-shaped good conductor piece (41) is cut and
When connecting the ground wire (2), the ground wire (2) should be
Whole cross-section of the body piece (41) in the unexpanded state and electric
So that they are in contact with each other, and then this plate-shaped good conductor piece
(41) The cutting hole for embedding (6) except for the connecting portion
According to the size of the
Then, the burial cutting hole (6) is closed and the mesh guide
There is provided a grounding method, which is characterized by burying a body in the ground .

In the grounding method of the present invention, the grounding resistance when the grounding conductor is in surface contact like a conventional grounding sheet has a great influence on whether or not the entire grounding surface is completely filled with the conductor. It is based on the fact that you do not receive.

[0007]

[0008] By pulling in the width direction
The flexible long plate-like good conductor (4) is, for example,
As shown in "Requirement 2", "a large number of slits (42) are formed vertically"
The flexible plate-shaped member provided in the opposite direction "and" Claim 3 "of the present application.
As shown, "Thin conductor (8) was previously knitted into a mesh.
Later, it is compressed in the width direction to form a flexible plate-like body (9).
Tamono ”and the like.

The present invention is also shown in "Claim 4" of the present application.
As you can see, "the ground wire (2) extended from various devices and this
Electrically connected to the ground wire (2) of the ground and below the ground (G)
The mesh conductor, which is composed of a mesh conductor (3) to be embedded,
The object (3) spreads in a net shape by pulling in the width direction.
It is composed of a flexible good conductor, and the ground wire (2)
Electrically with the widthwise entire cross section of this conductor without expansion
They are connected so that they come into contact with each other.
Ground structure (1) characterized by being expanded in a circular shape
Can be provided.

In the grounding structure (1) of the present invention, the ground wire is
The net-like conductor (3) connected to (2) is a tape-like object with a narrow width when stored or transported, and a flexible long plate-like good conductor (4) that can be wound in a coil shape. ) Cut pieces (41). That is, the mesh conductor used in the present invention (3)
In the above, the long plate-shaped good conductor (4) is cut to an appropriate length at a grounding site and expanded into a net shape. The cutting piece (41) has an advantage that it can be connected very easily by using, for example, a compression C-type clamp or a crimping terminal (5) when connecting to the ground wire (2).

The flexible material forming the mesh conductor (3)
The plate-shaped good conductor is cut from the long plate-shaped good conductor (4) described above.
Examples include the cut good conductor piece (41).

The above grounding method and grounding structure of the present invention.
In the structure (1), the grounding reducing agent can be used together when the cutting hole (6) is buried, as in the conventional case.

[0013]

[Function] The present invention "claim 1" , "claim 2" and "claim"
According to the ground method according to the 3 ", you in the field of applying the ground
According to the size of the cutting hole (6) cut for grounding.
Flexible and long plate-like good conductor (4) plate-like with appropriate length
Plate-shaped good conductor piece obtained by cutting out the good conductor piece (41)
The ground wire (2) is connected to the plate-shaped good conductor piece (41) at (41).
Electrical contact with the entire cross section of the non-expanded width direction
And the plate-shaped good conductor piece (4
1) Must be expanded in the width direction to form a mesh conductor
Becomes Since the above mesh conductor is very flexible,
・ Easy to bend in a diagonal direction so that it follows the shape of the cutting hole.
It is possible to obtain a good grounding area.
It The ground wire (2) is the width of the plate-like good conductor piece (41).
Since it is in electrical contact with all facing sections, the ground wire (2)
Current from the board is very smooth to the plate-like conductor piece (41)
Will be guided.

According to the grounding structure according to the "claim 4" of the present application
For example, the end of the ground wire (2) extending from various devices is mesh-shaped.
Electrically connected to the entire cross section of the conductor (3) narrowed in the width direction
The flexible structure is expanded in the width direction except for this connection part.
It is formed in a simple mesh conductor part, and this mesh conductor part is
It can be bent freely in the horizontal and diagonal directions to form the bottom and wall of the grounding hole.
Good contact and earns a contact area. Therefore, the ground wire
The current flowing through (2) is a mesh conductor with a large area.
(3) A mesh conductor that is easily guided to the entire cross section in the width direction
Dispersed on the road and quickly escaped to the ground (G).
It

[0015]

The present invention will be described in detail below with reference to the illustrated embodiments, but the present invention is not limited thereto. Embodiment 1 FIG. 1 is a perspective view of an example of a ground structure for carrying out the method of the present invention. In the figure, the grounding structure (1) includes a grounding wire (2) extending from various devices and wired below the ground (G), and a mesh conductor (3) having one end connected to this grounding wire (2). ) And.

The reticulated conductor (3) is composed of a cut piece (41) appropriately cut from a long plate-shaped good conductor (4) wound in a coil shape as shown in FIG. A copper tape or an aluminum tape is preferably used as the long plate-shaped good conductor (4). The cut piece (41) is shown in a schematic plan view in FIG. 3, and has a large number of slits (42) intermittently and in parallel in the longitudinal direction of the long plate-shaped good conductor (4). Is provided. Therefore, when the cut piece (41) is pulled in the width direction, the slits (42) are opened and expanded in a mesh shape as shown in FIG. 4 to form the mesh conductor (3). The degree of this expansion can be adjusted according to the bottom surface of the cutting groove to be buried. Further, the connection between the mesh conductor (3) and the grounding wire (2) is simply made by bundling the connection ends of the mesh conductor (3) as shown in FIG. 5, for example, by a compression terminal (5). be able to.

The cutting piece (41) connected to the ground wire (2) as described above is expanded according to the bottom area of the burial cutting hole (6) as shown in FIG. It is laid on the bottom surface of the cutting hole (6) and, if necessary, filled with a ground contact reducing agent (cement mixed with carbon powder etc.) (7) and covered with soil to bury the cutting hole (6).

The long plate-shaped good conductor (4) is preliminarily knitted in a mesh shape with a thin copper wire (8) as shown in FIG. 7, instead of being composed of the copper tape or the aluminum tape as described above. Can be compressed in the width direction to form a long plate-like body (9) as shown in FIG. 8, which can be wound as shown in FIG.

As described above, the reticulated conductor used in the grounding structure of the present invention is obtained by appropriately cutting the long plate-shaped good conductor wound in a narrow width so as not to be bulky during grounding work. Good handling such as transportation. In addition, the mesh conductor can be connected to the ground wire very easily and reliably. Further, since it is possible to expand the cutting hole for embedding, the entire cutting hole can be effectively used. Moreover, since it is spread like a net, it can adapt very flexibly to the unevenness of the cutting hole, has good contact with soil, and has a significantly high ground contact effect.

[0020]

According to the present invention, the grounding resistance is similar to that of the conventional grounding sheet, but the handling during transportation and construction is very simple, and the grounding method and the grounding structure are extremely simplified. Can be provided. In addition, since the ground contact portion is mesh-like, it can adapt to any shape of cutting hole and any uneven surface,
It has very good compatibility with soil and can obtain a high ground contact effect. Furthermore, since a large number of barb-like structures are formed in the mesh-like grounded portion, surge resistance due to electric field concentration can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a grounding structure for implementing a grounding method of the present invention.

FIG. 2 is a schematic view of an example of a long plate-shaped good conductor used in the present invention.

FIG. 3 is a schematic plan view of a cut piece of the long plate-shaped good conductor of FIG.

FIG. 4 is a schematic plan view of the cut piece of FIG. 3 when expanded in the width direction.

FIG. 5 is a structural explanatory view of an example of connection between a ground wire and a mesh conductor.

[Fig. 6] Diagram for explaining the structure during grounding work

FIG. 7 is a schematic plan view of another example of the mesh conductor.

FIG. 8 is a schematic view of a main part of a long plate-like body obtained by compressing a net-like body made of thin copper wires

FIG. 9 is a schematic view of another example of a long plate-shaped good conductor.

[Explanation of symbols]

(1)… Grounding structure (2)… Grounding wire (3)… Reticulated conductor (4)… Long plate good conductor (5)… Compression terminal (6)… Cutting hole (7)… Grounding reducer (8) … Fine copper wire (41)… Cut pieces (42)… Slits

Claims (4)

(57) [Claims] 1. A method for embedding a ground wire extending from various devices under the ground to ground the ground wire, which is flexible and can be expanded in a net shape by pulling in the width direction.
A long plate-shaped good conductor is buried under the ground intended to be grounded.
The plate shape obtained by cutting according to the size of the installation cutting hole
When connecting the above ground wire to the conductor piece, make sure that the ground wire is
Makes electrical contact with the entire width-direction cross section of the conductor piece without expansion.
Connecting by touching and embedding the above except the connecting part
Expand into a mesh according to the size of the cutting hole for
A grounding method characterized in that a plate-shaped good conductor piece is buried in the ground by closing an installation cutting hole . 2. A long plate-shaped good conductor having a large number of slits
Characterized by being a flexible plate-like member provided in the vertical direction
The grounding method according to claim 1, wherein 3. A long plate-shaped good conductor is previously formed by a thin conductor wire.
After being knitted into a mesh, it is compressed in the width direction and is a flexible plate
2. The ground according to claim 1, characterized in that
Way . 4. A ground wire extending from various devices, and
A net that is electrically connected to the earth ground line and is buried under the ground
And a net- shaped conductor, and the net- shaped conductor is reticulated by pulling in the width direction.
It is composed of a flexible good conductor that can be expanded, and the ground wire is
Electrically with the widthwise entire cross section of this conductor without expansion
They are connected so that they come into contact with each other.
A grounding structure characterized by being expanded like a circle .